Jet Lag Recovery Days Calculator
Gives a rough idea of how long it takes to feel normal after a long flight.
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The formula
days to adjust = hours of shift ÷ hours a day about 1 hour a day going east, 1.5 going west
Rates from the US CDC. Beyond 12 zones the body clock shifts the shorter way round, so 16 zones east counts as 8 zones west. Part days are rounded up.
What to watch out for
Daylight at the right time of day is what moves the body clock. Keeping to local mealtimes and bedtime from the first day tends to help. Ask a doctor about sleep medication or melatonin.
Frequently Asked Questions
How long does jet lag last?
The usual rule of thumb is one day per time zone. The US CDC puts adjustment at about an hour a day going east and an hour and a half going west, so a 6-zone trip takes about 6 days east and 4 days west.
What if I crossed more than 12 time zones?
The clock difference is what counts. A 16-hour difference is also 8 hours the other way, so flying 16 zones east adjusts like 8 zones west, in about 6 days.